var args = new Object();
var query = location.search.substring(1);
var lookup=new Object();
var pairs = query.split("&");
var loc;
var cat;
for(var i = 0; i < pairs.length; i++) {
  var p = pairs[i].indexOf('=');
  if(p == -1) continue;
  var argname = pairs[i].substring(0,p);
  var value = pairs[i].substring(p + 1);
  if(argname == 'loc')
    loc = value;
}